[adding maintainers of synth and ccache] On 6/29/20, Mark Millard <mark...@yahoo.com> wrote: > Based on "small arm system" context experiments > mostly . . . > > If your console messasges do not include > messages about "swap_pager_getswapspace(...): failed", > then it is unlikely that being out of swap space > is the actual issue even when it reports: "was killed: > out of swap space" messages. For such contexts, making > the swap area bigger does not help. >
It did not show those getswapspace messages. > In other words, "was killed: out of swap space" > is frequently a misnomer and not to be believed > for "why" the kill happened or what should be > done about it --without other evidence also being > present anyway. > > Other causes include: > > Sustained low free RAM (via stays-runnable processes). > A sufficiently delayed pageout. > The swap blk uma zone was exhausted. > The swap pctrie uma zone was exhausted. > > (stays-runnable processes are not swapped out > [kernel stacks are not swapped out] but do actively > compete for RAM via paging activity. In such a > context, free RAM can stay low.) > > The below material does not deal with the > the "exhausted" causes but does deal with > the other 2. > > Presuming that you are getting "was killed: out > of swap space" notices but are not getting > "swap_pager_getswapspace failed" notices and > that kern.maxswzone vs. system load has not > been adjusted in a way that leads to bad > memory tradeoffs . . . > > I recommend attempting use of, say, (from > my /etc/sysctl.conf ): > Attached is what I tried, but when I ran synth again, I got a corrupted HDD that fsck refuses to fix, whether in 1U mode or with fs mounted. It just will not SALVAGE even when I add the -y flag. What got corrupted was one of the /usr/.ccache directories, but 'ccache -C' doesn't clear it. I restored the original /etc/sysctl.conf, but I can't add packages or ports any more, so I'm afraid I'm going to have to dd if=/dev/zero the disk and reload from 12.1R and start over again. I can't even 'rm -Rf /usr/.ccache'. It says 'Directory not empty'. I don't need this system up and running, so I'm not going to make any more changes until I see if any of you have suggestions to try first. -- Don Wilde **************************************************** * What is the Internet of Things but a system * * of systems including humans? * ****************************************************
sysctl.conf.new
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